<!DOCTYPE html>
<html>
    <head>
        <script src="./test/test.ts" type="module" defer></script>
    </head>
    <body style="display: flex; margin: 0; height: 100vh; justify-content: stretch; align-items: stretch;">
        <textarea id="a" style="flex: 1; height: 100%; resize: none;"></textarea>
        <textarea id="b" style="flex: 1; height: 100%; resize: none;"></textarea>
    </body>
</html>